_test_exist

_test_exist

Search a function/variable in the current environment. Return 1 if the function was found. It is usefull to test the presence of specific extensions (such as SQL plugin) before compiling a package referencing these functions : if you compile a package referencing missing functions, an runtime error will occur.

I _test_exist (

S _function_name_

)

Parameters

_function_name_

any name of function

Return value

1 if the function exists, 0 or nil if not.

Error :

EOK if success.
EARGNIL if the function name is nil.
ECHN if the channel is invalid.
EENV if the environment is invalid.
ENOFOUND if the function is not found in the current environment.